8
Answer: BSet 3: Ratios Rates Proportions (Advanced)
Explanation
PROBLEM
A mixture is made of two substances in the ratio 3:4. If the total mixture is 42 liters, how many liters is the first substance?
A mixture is made of two substances in the ratio 3:4. If the total mixture is 42 liters, how many liters is the first substance?
A.
20
B.✓ Correct
18
C.
36
D.
16
Detailed Explanation
Choice B is the best answer. First substance = 3/(3+4) times 42 = 3/7 times 42 = 18 liters
Why others are wrong:
A: 20 is incorrect because it does not satisfy the equation.
C: 36 is incorrect because it does not satisfy the equation.
D: 16 is incorrect because it does not satisfy the equation.